Third to emma g



(No Model.) Y

C. L. DUNHAM.

PIPE WRENCH.

10.332,191. Patente L Yffnegs. InUnnon 1% Czar/er unawz.

N. PETERS. MOM-W Wullkxgwn. DV Q UNITED STATES PATENT Price.

CHARLES L. DUNHAM, OF UNION CITY, PENNSYLVANIA, ASSIGNOR OF ONE- THIBD TO EMMA G. DIEFENDORF, OF SAME PLACE.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 332,191, dated December 8, 1885.

Application filed October 31, 1885. Serial No. 181,543. (No model.)

To all whom it may concern:

Be it known that I, CHARLEs L. DUNHAM, a citizen ofthe United States, residing at Union City, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Pipe-Vrenches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention relates to pipe-wrenches; and it consists in the improvements hereinafter set forth and explained.

My invention is illustrated in the accompanying drawings, in which Figurel is a side elevation of my improved pipe-wrench, showing it closed upon a section of pipe. Fig. 2 is a perspective view of my improved pipe- Wrench, showing it open.

Like letters refer to like parts in both figures.

In constructing my improved pipe-wrench the handle A is made of any convenient length, and has in the lower end thereof a slot, C, to receive the end of the section B, hinged thereto, the arms forming the slot C being also provided with segmental rack-bars D, arranged eccentrically to the pintle E therein.

The portion of the wrench for engaging the pipe is constructed of the parts or sections B F G H, hinged together by means of pintles I J K, these hinges or joints being constructed so that the sections B FG H, when open, will form a hook, substantially as shown in Fig. 2, that can be hooked around the pipe upon which it is to be used. The sectionH is slotted at L, so that it will close over the portion B of the section B,and it is also provided with segmental rack-bars N N, adapted to engage with the eccentric rack-bars D when closed around a pipe, as shown in Fig. l, so that the hinged sections B F G H may be firmly closed against the pipe by moving the handle A, as shown in Fig. 1. In the section G, I construct a groove or slot, O, in which I place a sharp-edged bit, P, so that when the sections B G F H are clasped around a pipe the edge of the bit P will tend to bite into the pipe and prevent slipping. I have shown but one bit, P, for this purpose;

but I can use such bits in any or all of the sections B F G H with equal facility, if desired. The hinges shown connecting the sections BF G H together are ordinary stop-hinges, made by forming a slot-in one section and a tenon on the other, the parts being held together by ordinary pintles, the stops in each hinge being fixed so that the hinged sectionsB F G H can only be opened sufficiently to easily hook around the largest size of pipe for which a given size ofwrench is constructed. They can, however, be closed together sufficiently to grasp the smallest pipe for which the wrench is adapted. For example, a wrench large enough to take in two-inch pipe will fit all sizes down to and including one and a quarter inch and other sizes of wrench in the same proportions. y

In operating my improved wrench it is opened, as shown in Fig. 2, and hooked around the pipe. The section H is then grasped and closed around the pipe, as shown in Fig. l, so that the rack-bars N and D will intermesh with each other when, by pressing down upon the handle A, the sections B, F, G, and H are closed against the pipe Q, tightly clutching it on all sides. The greater the force exerted on the handle A the more tightly the pipe is clutched. It will thus be seen that in operation my improved wrench operates on all portions ofthe pipe alike, thus avoiding all danger of crushing in one side of the pipe, as is often the case with the ordinary forms of pipewrenches used.

Having thus fully described my improvement, so as to enable those skilled in the art to which it appertains to construct and use the same, what I claim as new, and desire to secure by Letters Patent of the United States, 1s-

1. The combination, in a pipe-wrench, of a handle having segmental rack-bars thereon with a series of sections hinged together, one end section of the series being hinged to the said handle and the other end section provided with segmental rack-bars intermeshing with the rack-bars on the handle, said sections being adapted to clasp and grip a pipe, substantially as and for the purpose set forth.

2. The combination, in a pipe-wrench, of a handle slotted at the end and having segmental ICO D and a slot, C, with the section B, hinged thereto, and a series of sections, F,G, and H, hinged to the section B, the section G being provided with a bit, Hand the section H having the slotL therein andthe segmental rackbars N thereon, substantially as and for the purpose set forth.

In testimony whereof I afx my signature in presence of two Witnesses.

CHARLES L. DUNHAM.

Witnesses:

E. DIEFENDORF, H. J. OURTZE.- 

